Critics of the ongoing negotiations claim that a vastly reduced capacity for uranium enrichment is not a sufficient concession by Iran because this does not nip its nuclear programme in the bud, and if it decides to weaponise at a later date, the option remains open. According to them, the current talks do nuclear non-proliferation efforts a great disservice, and the only deal worth taking is one in which Iran surrenders its nuclear programme in its entirety, and in perpetuity.
This argument is counter-intuitive for three reasons.